40results about How to "Effective noise reduction effect" patented technology

The invention discloses a kitchen ventilator with an oil-smoke separation device and a noise reduction device and a noise reduction method. The kitchen ventilator comprises a kitchen ventilator body,the three-dimensional space sound field noise reduction device for active noise reduction, and the oil-smoke separation device for absorbing and separating lampblack particles. The three-dimensional space sound field noise reduction device is assembled into the kitchen ventilator body. The oil-smoke separation device is assembled into the kitchen ventilator body in a driving mode.The three-dimensional space sound field noise reduction device is provided with a noise collection sensor and a noise reduction body. The noise collection sensor is used for detecting decibel of noise sources in the kitchen ventilator body. The noise reduction method includes the steps of decomposing a noise signal into multiple sub-band signals, acquiring a band-pass filter weight vector through conversion, converting the acquired band-pass filter weight vector into a corresponding loudspeaker sound field, transmitting a constant-strength sound wave signal to a corresponding loudspeaker, and reducing or eliminating noise waves generated by the kitchen ventilator through sound waves generated by the corresponding loudspeaker to reduce noise. The kitchen ventilator has the advantages that the technical problem of conflict between the noise and performance is solved, and on the premise of not sacrificing lampblack suction performance of the kitchen ventilator, the noise generated during operation of thekitchen ventilator is low and does not cause negative influence on users physiologically and mentally.

The invention discloses a roadbed edge protection device with a noise reduction function for highway construction. The roadbed edge protection device comprises a first combined protection main body, abuffer anti-collision plate, a second combined protection main body, a buffer frame, a small water pump, a mounting sleeve, a filter cover, a buffer spring and a transmission spiral shaft, and the first combined protection main body is combined and connected with the second combined protection main body through a connecting shaft fixedly mounted on the outer wall of one side of the first combinedprotection main body; according to the invention, an anti-collision mechanism is mounted on the outer part; a buffer rod of the anti-collision mechanism can directly relieve the impact force of collision; meanwhile, a part of impact force is also dispersed to a buffer spring in the mounting shell; the anti-collision mechanism can buffer impact force in the horizontal direction and the vertical direction at the same time, a good anti-collision effect is achieved, a fixing shaft with the extrusion spring is installed outside the anti-collision mechanism, if the anti-collision mechanism is damaged in the using process, the fixing shaft can be directly pulled down, taking and installing are convenient, the overall protection device does not need to be replaced, and the device is practical.

The invention relates to the technical field of refrigeration equipment, and discloses a noise reduction and air supply device for a refrigeration display cabinet, the noise reduction and air supply device comprises a goods shelf bottom box, an air inlet is formed in the top of one side of the goods shelf bottom box, an air supply duct is formed in the other side of the goods shelf bottom box, and a motor set is movably mounted in an inner cavity of the goods shelf bottom box. By arranging the fan blades and the air increasing bag, on the basis of an existing motor set, the fan blades and the air volume capable of being sucked by the fan blades, a certain ventilation quantity is increased for the inner cavity of the goods shelf bottom box, by arranging the blocking plate, kinetic energy of air flow is consumed through impact, the air flow speed is reduced, and the effective noise reduction effect is achieved; the heat conduction between the noise reduction clamping plate and the barrier plate is utilized to heat the air flow circulating in the air outlet, so that the temperature of the air circulating in the inner cavity of the goods shelf bottom box is further improved, the frosting degree of the surface of the evaporator is effectively reduced, and the frosting period is shortened.

The invention discloses a plastic granulating and screening all-in-one machine for a plastic modification process. The plastic granulating and screening all-in-one machine comprises an all-in-one machine body, a screen, a first discharging port, a fastening screw, a partition plate, a second discharging port, a third discharging port, a frame, a double-layer air suction port, a cross beam, a monitoring mechanism, a noise reduction device, a feeding port, an operation button, a granulating cavity, a movable sliding plate, a pull ring, a transparent liquid bin, a sound insulation plate and sound absorption cotton, wherein the screen is arranged in the all-in-one machine body, the second discharging port is formed in one end of the screen, the first discharging port is formed in one side of the second discharging port, the third discharging port is formed in the other side of the second discharging port, the partition plate is arranged at the top of the second discharging port, and the fastening screw is arranged at the top of the partition plate. Dust and other impurities in plastic particles can be sucked away through the double-layer air suction port, so that the cleanliness of the particles is guaranteed, the particles can be conveniently screened in the screen, and the working efficiency of the granulating and screening all-in-one machine is improved.

The invention relates to an audio noise filtering system, which is provided with a mobile terminal and comprises a first audio acquisition module used for acquiring a noise value of an environment where the mobile terminal is located; a second audio acquisition module used for acquiring a target audio of a target sound source; and an audio processing module electrically connected with the first audio acquisition module and the second audio acquisition module, and used for acquiring the noise value and the target audio, comparing the target audio with the noise value, and removing the audio with the same noise value in the target audio. According to the audio noise filtering system, the noise value is independently recorded and compared with the target audio, so that the purpose of removing the noise value in the target audio is achieved, and the effective noise reduction effect is achieved.

The invention relates to the technical field of production and manufacture of boiler accessories, and discloses a silencer for a steel plant boiler. The silencer for the steel plant boiler comprises ashell, wherein a gas inlet is formed in the bottom of the shell, gas and noise generated in the boiler enter the shell through the gas inlet, the gas and noise are subjected to primary silencing on asilencing ring after being relatively cooled by a cooling plate, and then secondary and tertiary silencing are carried out on a silencing cylinder and a silencing pad to finish the silencing work ofthe boiler. Due to the fact that an air outlet arranged at the top of the shell faces upwards, dust often falls into the air outlet, the falling dust flows to dust collecting plates on the two sides after being shunted by a shunt cone, the falling dust enters the interior of the dust collecting plates from dust collecting nozzles at the tops of the dust collecting plates, and then the dust is conveyed into a dust collecting box through the vibration of sliding plates and the dust collecting plates. The silencer for the steel plant boiler is simple in structure and easy to operate, effectivelyprevents dust from falling into the silencer and has the efficient dustproof effect.

The invention provides a phononic crystal sound barrier with a self-adaptive function. The phononic crystal sound barrier comprises scatterer tubes capable of adjusting the size of a resonant cavity, a sensor, a controller, a driver, an actuator, two stepping push rods, a control panel, a connecting plate and a connecting mechanism of the scatterer tubes. The scatterer in the phononic crystal sound barrier provided by the invention can pick up an audio signal of noise by a sound pick-up according to different main noise frequency bands and transmit the audio signal to a single-chip microcomputer; corresponding noise reduction pulses generated by the single-chip microcomputer act on a stepping motor to drive the stepping motor to rotate, so that the stepping push rods drive the control panel to move, and the inclination degree of each base cotyledon is changed; and then the frequency range of the band gap of the scatterer is changed through the outer diameter of a hinge scatterer and a resonant cavity, so that the band gap frequency band of the scatterer corresponds to the maximum noise amplitude frequency band, the noise environment can be automatically adapted, effective reflection and absorption attenuation of the sound barrier on different noise frequency bands are remarkably enhanced, the effect is good, and noise reduction is more targeted.

The invention discloses an exhaust hood which comprises a fan assembly and a silencer. The fan assembly comprises a fan box and a fan arranged in the fan box; the fan box is provided with a wind inletand a wind outlet; an air inlet and an air outlet are formed in two ends of the silencer; the air outlet communicates with the wind inlet; the silencer is provided with a silencing channel and a silencing cavity communicating with the silencing channel; and the air outlet communicates with the silencing channel and/or the silencing cavity. According to the technical scheme provided by the invention, the noise of the exhaust hood is reduced.